Manufacture method of extremely-thick steel plate for hydropower station through continuous-cast billet

A technology of extra-thick steel plate and manufacturing method, which is applied in metal rolling and other directions, can solve the problems of high strength of steel plate, high and low temperature impact toughness, etc., and achieve high strength, good weldability of weld seam, uniform and stable low temperature impact toughness Effect

Active Publication Date: 2013-04-03
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problem that the existing technology cannot meet the high strength and high and low temperature impact toughness of the steel plate

Method used

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  • Manufacture method of extremely-thick steel plate for hydropower station through continuous-cast billet
  • Manufacture method of extremely-thick steel plate for hydropower station through continuous-cast billet
  • Manufacture method of extremely-thick steel plate for hydropower station through continuous-cast billet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 400mm specification continuous casting slab is used to produce 110mm specification hydropower steel. Continuous casting adopts dynamic soft reduction technology, and the weight percentage of the chemical composition of the slab is: C: 0.078%, Si: 0.22%, Mn: 1.26%, P: 0.009%, S: 0.001%, Ni: 1.05%, Mo: 0.36 %, B: 0.001%, V: 0.042%, the balance is Fe; Ceq is 0.42%, Pcm is 0.20% (where: Ceq = C+Mn / 6+Si / 24+Ni / 40+Cr / 5+Mo / 4+V / 14, Pcm = C+Si / 30+Mn / 20+Cu / 20+Ni / 60+Cr / 20+Mo / 15+V / 10+5B). Attached is the low-magnification photo of the 400mm thick continuous casting slab figure 1 As shown, the segregation grade is ≤ grade 1 of class C, and the porosity is ≤ grade 1.0. The slab heating temperature is 1230°C, in the furnace for 320min, and the furnace temperature is 1200°C. 19MPa high-pressure water is used for descaling before rolling, the rolling start temperature is 1170°C, the reduction rate of each pass is within 15% to 20%, the final rolling temperature is 990°C, the thicknes...

Embodiment 2

[0042] Example 2 On the basis of Example 1, a 400 mm thick steel billet is used to manufacture a 150 mm thick steel plate, and the compression ratio of the steel plate is further reduced. Continuous casting adopts dynamic soft reduction technology, and the weight percentage of the chemical composition of the slab is: C: 0.083%, Si: 0.23%, Mn: 1.30%, P: 0.009%, S: 0.002%, Ni: 1.10%, Mo: 0.38 %, B: 0.0013%, V: 0.043%, the balance is Fe; Ceq is 0.43%, and Pcm is 0.21%. Attached is the low-magnification photo of the 400mm thick continuous casting slab Figure 5 As shown, the segregation grade is ≤ grade 1 of class C, and the porosity is ≤ grade 1.0. The slab heating temperature is 1240°C, in the furnace for 330min, and the furnace temperature is 1200°C. Before rolling, 19MPa high-pressure water is used for descaling. The rolling start temperature is 1170°C. The reduction rate of each pass is within 15% to 20%. The final rolling temperature is 1000°C. 2.67. The steel plate ente...

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Abstract

The invention provides a manufacture method of an extremely-stick steel plate for a hydropower station through a continuous-cast billet, and belongs to the technical field of production of continuous-cast steel plates. The manufacture method comprises the technological processes of continuous casting, rolling, cooling after rolling, austenite quenching, subcritical quenching and high-temperature tempering, thus a composite-phase structure of ferrite, acicular ferrite, small granular bainite and small residual bainite can be formed in the core part of the steel plate after the high-temperature tempering. The manufacture method has the advantages that the extremely-thick steel is given the same performance as the thin steel plate under the combination and organizational control of heat treatment process based on the smaller proportion; and compared with the methods of die casting and forging, the manufacture method provided by the invention is simple, convenient, easy to carry out and high in yield, and reduces the producing cost.

Description

technical field [0001] The invention belongs to the technical field of continuous casting steel plate production. In particular, it relates to a method for producing extra-thick steel plates for hydropower stations by continuous casting slabs. It is mainly aimed at the manufacture of 600Mpa extra-thick steel plates. Background technique [0002] Hydropower is clean energy, renewable, non-polluting, low operating cost, convenient for power peak regulation, and conducive to improving resource utilization and comprehensive economic and social benefits. The 600Mpa extra-thick steel plates used in hydropower stations are mostly used in the production of four key parts of high-pressure water diversion pipes, crescent ribs, branch pipes, and turbine volutes. The pressure-bearing capacity, welding performance, and especially low-temperature impact toughness of steel plates are extremely high. [0003] However, when continuous casting slabs are usually used to produce extra-thick s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02B22D11/00B21B1/02C21D1/18
Inventor 赵楠隋鹤龙邹扬秦丽晔姜中行刘建明吴斌金茹张学峰冯路路
Owner SHOUGANG CORPORATION
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